Hello Debbie Watkins, 

Can you please refer to the below link:

https://www.odoo.com/forum/help-1/question/odoo-online-homepage-change-background-color-which-i-can-do-using-studio-and-now-i-want-to-change-the-menu-color-170955 for a way to do this without a module or needing to edit source code files.

Maybe this useful for you.

Thank you!

Regards,

Email:      odoo@aktivsoftware.com  

Skype: kalpeshmaheshwari